function getCookie(c_name)
{
	if (document.cookie.length>0)
	{
		c_start=document.cookie.indexOf(c_name + "=");
		if (c_start!=-1)
		{
			c_start=c_start + c_name.length+1; 
			c_end=document.cookie.indexOf(";",c_start);
			if (c_end==-1) 
				c_end=document.cookie.length;
			return unescape(document.cookie.substring(c_start,c_end));
		} 
	}
	return "";
}

function setCookie(c_name,value,expiredays)
{
	var exdate=new Date()
	exdate.setDate(exdate.getDate()+expiredays)
	document.cookie=c_name+ "=" +escape(value)+
		((expiredays==null) ? "" : ";expires="+exdate.toGMTString())+
		"path=/;"
}

function checkCookie()
{
	username=getCookie('username')
	if (username!=null && username!="")
	{
		alert('Welcome again '+username+'!')
	}
	else 
	{
		username=prompt('Please enter your name:',"")
		if (username!=null && username!="")
		{
			setCookie('username',username,365)
		}
	}
}
